package com.sky.admin.aspect;


import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Pointcut("@annotation(com.sky.annotation.AutoFill)")
    private void pt(){}

    @Before("pt()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段的填充");

        //获取到当前被拦截的方法上的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();

        if(args == null || args.length == 0)return;

        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();

        //根据当前不同的操作类型，为对应的属性通过反射来赋值
        if(operationType == OperationType.INSERT){
            try {
                // java反射
                Method setCreateTime = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setCreateTime.invoke(entity,localDateTime);
                setCreateUser.invoke(entity,id);
                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,id);

            } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        } else if (operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser = entity.getClass().
                        getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setUpdateTime.invoke(entity,localDateTime);
                setUpdateUser.invoke(entity,id);

            } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) {
                throw new RuntimeException(e);
            }
        }

    }

}
